Game Programming News and Tutorials - Site with a series of beginner level tutorials about OpenGL. There are tutorials about OpenGL primitives, transformations, lighting, texturing, blending, particle systems, stencil shadows, and motion blur. Each tutorial also includes source.

Swiftless.com - a very nice site with tutorials for graphics rendering and physics interactions. The site has tutorials aimed towards hobbyist game developers and anyone who may want to learn how to use certain API's or programming languages, or even those who just want to learn how to write programs.